Better? That's in the opinion of the shooter, of course, but not for me. I suspect this gun will not sell in large numbers because ammo is hard to find unless you live near a sporting goods superstore like Cabela's or Bass Pro Shops and that most shooters are not familiar with the round and that they have settled on the more traditional rounds already.
The GP100 in .357mag really is the epitome of the combat revolver. Many shooters who carry for self defense and/or compete in revolver classes share this opinion, so it's not just an armchair statement. Cut for moon clips, it's an even more outstanding gun.
Unless you have shot and fallen in love with the .44spl or are a collector with the extra cash, I would ignore it.
Now the Ruger Redhawk in .45acp/.45Colt? That's a terrific idea! Get one of those!